Manufacture of wheel disks



' Nov. 2,1926. 1 1,605,755

4 A. J. MICHELIN [MANUFACTURE OF WHEEL DISKS Fild Feb/21, 1922' 5Sheets-Sheet 1 Nov. 2 1 926.

A. J. MICHELIN MANUFACTURE OF WHEEL DISKS Filed Feb. 21, 1922 5Sheets-Sheet 2 N as g Mk R awmzmzkazzfi Mm ab "Nov. 2 I926.v 1,605,755

. A. J. MICHELIN MANUFACTURE OF WHEEL DISKS Filed Feb. 21, 192? 5Sheets-Sheet 3 IIEW ' N I JI N N 5W6 Jul WM h Q 3 H W- Nbv. 2 192K A. J.MlCHELIN MANUFACTURE OF WHEEL DISKS Filed Feb. 21 1922 5 Sheets-Sheet 4Patented Nov. 2, 1926.

ANDRE JULES MICHELIN, OF GLERMONiT-FERRAND, FRANCE.

MANUFACTURE OF JV HEEL DISKS.

Application filed February 21, 1922. Serial No. 538,258.

My present invention relates to improvements in the manufacture of webplates for vehicle wheels, in which an annular disk is used, to whichdisk the metal rim adapted to carry the tire is attached, and the diskand the rim carrying said tire are adapted to be detachably connected tothe hub of the wheel.

My present invention is especially directed to the improved manner ofrolling out the disk to the proper tapered form before it is dished orflanged.

The present invention relates therefore only to that step of rolling thedisk to the desired thickness in its various parts, and

' does not relate at all to the subsequent operations of shaping thedisk or machining the same before the rim is attached.

According to my present invention I provide a blank in the form of anannular disk of malleable metal, preferably forged steel, which may berolled either hot or cold, but preferably hot, into an annular plate,preferably having a thickened central portionand tapering in thicknessfrom the center towards the periphery. The central portion, wlliclrisprovided when the web plate is completed, forms a reinforced bearing forthe fastening bolts, by means of which the web plate is attached to thehub of the .wheel.

My invention will be more fully understood after reference to theaccompanying drawings, in which like parts are indicated f by similarreference symbols throughout the several views, and in which Figure 1 isa plan view, partly in section, of the apparatus in which the plate isrolled from the disk.

The disk is not shown in this figure. Figure 2 shows a vertical sectionalong the broken line 22 of Fig. 1, and, looking in the direction of thearrows.

Figure 3 shows a vertical section along the broken line 33 of Fig. 1,and looking in the direction of the arrows.

Figure 4 is a detail showing the cam used for regulating the distancebetween the rolls. Figure 5 is a plan view, partly in section, of theapparatus for holding the disk in place while it is being rolled.

Figure 6 shows a section, on a larger scale, of the left-hand portion ofFig. 5, said section beingtaken along the line 66 of Figure 5.

Figure' 6 shows a section of the righthand portion of Fig. 5 on asimilar scale to Fig. 6, taken along the line ()6 of Figure 5;

Figure 7 shows a section along the line 77 of Figure 1, and looking inthe direction of the arrows;

Figure 8 shows a side elevation; and F igure 9 a cross section throughFig. 8 along the line 99 of the disk blank;

Figure 10 shows a cross section of the finished disk after the rollingbeen completed; and

Figure 11 shows a section along the line 1l -11 of Figure 10.

A and A represent the bed plates or castings on which the operativeparts are mounted, which bedplates are preferably mounted on a suitableconcrete construction B, and attached thereto by foundation bolts C, theWhole forming a very rigid structure. The

process has bed plates are provided with suitable bear- .ings for therotating parts, and where needed covers are provided, such as D, D

and Dishown in Figs. 1 and 2. These coversare omitted from the righthand portion of Fig'l so that the parts beneath may be properly shown.

E represents the driving shaft which may be driven in any convenientway, as by means of the pulley E. This pulley is merely typical of anysuitable means of applying the necessary power to the apparatus. Theshaft E is provided with two bevel gear wheels E? fast thereon, one ofwhich is shown exposed in Fig. 1 and the other being beneath the coverD. These bevel gears E mesh with corresponding bevel gears F on the stubshafts F, which are connected by the couplings F to the intermediate orconnecting shafts F, the Weightof which intermediate shafts is supportedon the yokes G, supported by the springs G. The sockets carrying theyokes are held in place by means of adjusting screws 9 shown in Fig. 1.

The forward end of this intermediate shaft F is connected by thecoupling F to the rear end of the corresponding roller shaft.- There aretwo of these roller shafts H and H, carrying the tapered rolls H and HBy this arrangement the intermediate or connecting shaft permits aflexible connection between the rear or stub shaft F and the rollershaft proper, which will permit the slight lateral movement of theroller shaft without disturbing the driving mechanism, as will behereinafter described. The tapered rollsH and H are in the form of,frustums of cones, having the ang'1e of the opposite cones so arrangedas to provide the requisite taper to the disk or blank incident to theoperation of the rolling.

The roller shafts H and H are journaled at their rear end in thrustbearings I, which are trunnioned as at I in the frame I, and in the capD, see Fig. 7; which frame may be slightly shifted horizontally by meansof the screw J, driven by the hand wheel J, which screw engages a nut orsleeve 1, as shown in Fig. 7. This adjusting arrangement is provided forboth shafts as shown in Fig. 1. The roller shafts are journaled neartheir front ends in grease bearings K and K ,provided with adjustablebearing blocks allowing for the expansion of the journals during therolling operation and adjustng of the center lines of the two rolls inthe same horizontal plane (essential condition for obtaining goodresults in rolling).

The "caring blocks are adjusted by means of wedges 91 operated withscrews 92 and with removable caps 93 adjusted by screws 94. see-Figs. 2and 3.

One of the lubricated bearings, such as K, is connected by means ofjournals, forming a swivel joint, to an arrangement having a certainelasticity produced by Belleville washers L. The swivel joint allows thebearing to be subject to a normal reaction of the shaft whatever itsmovements about rear thrust bearing while revolving.

The Belleville washers yield to an abnormal force caused by the advanceof the movable roll and thus prevent the breaking of any mechanicalparts. They are mounted on the stem Mwh ch passes through thescrewthreded sleeve M, and engages in the outer sleeve M held in thehousing A". The compression of the spring washers L aforesaid isadjusted by means of the screw arrangement just shown, and the purposeof this is to afi rd a resilient bearing which will permit thecorresponding roller H to yield slightly under the pressure incident tothe rolling operation.

The opposite bearing K is pressed upon by the hydraulic ram N, which isshown in the forward position in Figs. 1 and 3. This hydraulic ram movesin the heavy cylinder A, which may be suppliedwith' liquid, underpressure, from any convenient source, through the opening a", as shownin Fig. 3. The pressure exerted by this ram tends to force the roll Htowards the roll H. These bearings rest directly upon the base of milland are guided above by a cross'beam which connects parts A and A. Thiscross beam is provided with two guiding plates held up by means ofsprings andad usted by means of screws to obtain a smooth fit withoutappreciable play to allow moving of bearings sideways either when rollsare adjusted or during the rolling operation.

The piston N is normally pressed outwards, that is towards the disk tobe rolled by the hydraulic pressure referred to, but

. when this pressure is released it is drawn backwards by the Bellevillewashers or cup springs L, see Fig. l, which are mounted 611 the stems Lpassing through the yoke N fast to the piston rod N. f The position ofthis yoke and the consequent pressure on, the spring washers L may beadjusted by means of the nuts 02 engaging the screw threads n on thepiston rod N. Thus when the hydraulic pressure is turned on there is atendency of the piston to move outwards against the action'of the s ringwashers L,

and these washers not on y serve to withdraw the piston when thepressure is released, but also tend to ease the shock when the hydraulicpressure is turned on.

In order to secure uniformity of action, and to-cause the machine tocomplete, in a given cycle with as little waste of energy as possible,the operation of rolling each separate disk, 'I provide a positive lockarrangement which will control the outward movement of the hydraulicpiston N- which will now be described.

The piston rod N passes freely through the opening 1) in the heavy leverP, which is pivoted as at p in the bearing block 0. This lever P isprovided with-a socket p to engage the concave washer 01. mounted on thepiston rod N, which washer is adjusted in the desired position by meansof This cam R has very slight eccentricity, the.

maximum radius being at the point r. This cam is shown. in the positionfor the maximum inward movement of the piston in Fig. 3, and as turnedthrough 180 in Fig. 4.

The cam R is so rotated from the main driving shaft that it will performa single revolution incident to the entire operation of rolling eachsingle disk, as will be hereinafter more fully described. In order toaccomplish the rotation of this cam in the proper relation relative tothe rotation of the other parts of the mechanism, I provide means fordriving said cam from the main'driving shaft E, comprising the pulley'E", the belt S and. the parts driven belt S. drives the pulley-S,mounte tion of the driving shaft E will cause the from ornearer torolls.

rotation of the cam R, but at a very much reduced speed.

In order to throw the cam driving means into and out of engagement whendesired, I

rovide a suitable clutch mechanism R, as indicated diagrammatically inFig. 1. Any suitable clutch mechanism may be used for this purpose' orthe clutch mechanism may be omitted entirely if desired.

Thus it will be seen that I have described means for rotating the rollsand yet allowing a certain space between the'same, means for positivelyregulating the movement of one roll towards the other, maintainin theirrotating .movement through application of an intermediate shaft withcouplings, means for applying pressure to the rolls, and means forad]usting the position between the rolls." It now'remains to describethe means for feeding the disk to the rolls.

The arrangement for accomplishing the feeding operation is shown inFigs. 1,2 and 5 to 6, which will now be described.

The feeding apparatus is shown at the left of Figs. 1 and 2, and detailsthereof are shown in Figs. 5, 6 and 6. The blank is ordinarily in theform of a flat annular disk, as shown at T in elevation and in sectionin Figs. 8 and 9. which disk is provided with a central perforation t.The disk is shown in the finished form at T in Figs. 10 and 11, inwhichthere is a reinforced flat annular central portion t and a taperedweb 25 The perforation It remains the same after the disk has passedthrough the'rolling process hereinbefore described. t

The feeding device comprises a stand 1, which has longitudinaladjustment towards or away from the rolls, which adjustment is effectedby means of'the screw 2 turned by the hand wheel 3, see. Fig. 2. Thisadjustment is used for rolling disks of various diameters. For instanceto be able to roll disks of larger or smaller diameters it would benecessary to set the stand farther away At each end of this stand is anupright or standard 4, see Figs. 1.2, 6 and 6. Each standard is providedwitha chamber 5 to receive cooling water which is normally closed by ahinged cap 6,

" which cap is shown in Figs. 1 and 2, but is omitted from the otherfiguresfor the sake of clearness in the drawings.

Mounted in the head of the left-hand ed as at 8 to receive the screwcollars 9 and 10, and screw threaded at the other end as at 11 toreceive the screw collar 12. The col-' lar 12 is provided with e e bolts13 to which the springs 14 are attac ed, which springs are connected toeye-bolts 15, fast to the standard 4, and these springs tend to pressthe casing to the right, towards the disk T, as shown inFig. 5.

Mounted inside of the casing 7 is a sleeve or bushing 16 which issecured to the casing w 7 by means of the set screws 17, and thus thissleeve 16'slides with the casing 7. At the opposite end of the casingfrom the screws "17-the said casing is provided .with an annular head18, held in place by the set screws 19. This head is centrallyperforated as shown in Fig. 6. The sleeve 16 and the head 18 form guidesfor the hollow spindle 20, to the forward end of which is screwed thegripping member 21. This member is provided with a socket 22 to receivethe centering tongue of the opposite gripping member, as will behereinafter described.

The backward thrust of the spindle 2O is taken up by a suitable thrustball bearing comprising the fixed annular disk 23, provided with a ballrace 24 to receive the balls 25, in front of which balls is a bearingring 26 -and a washer 27 which engages the shoulder 28 of the spindle20. The rear end of the spindle is provided with a lock nut 29, held inplace by the set screw 30. Extending through the hollow spindle 20 is apipe 31 to supply the cooling medium, such as water, which enters thehollow head of the gripping member 21 and flows outwards throughpassages 32 therein, and back through the hollow spindle 20 into thechamber 33 contained in the cap 34, from whence it escapes'through theoutlet 35 and is carried to waste. This cap 34 is secured to the head 18by the screws 36. and the rear end of saidca-p is provided with asmaller screw cap 37'with a nozzle 38 for the hose or other source ofwater supply.

It will be seen that the springs 14 will tend to move the casing 7 andthe parts can ried thereby to the position for engaging the disk, butthat these will yield and permit the gripping member 21 to be pressedbackwards when the disk is held between said gripping members, as shownin Figs, 5 and 6.

The sideway springs 14 pulling on ring 12 facilitates placing of disk Tupon centering lug 41 in that it moves gripping member 21 to right.

movement obtained by ill) in position.

The backward movement of the casing 7 will be limited by the adjustingcollars 9 engaging against the shoulder 4 of the standard 4, whereas theforward.sliding movement of the spindle 20 will be limited by stop.collar 12 shown to the left in Figgftir- Suitable packing. may beprovided where desired, such as the packing 39, shown to the right ofFig. 6.

I have described the left-hand gripping member and parts connectedthereto, as shown in Figs. and 6; the opposite gripping member with theparts connected thereto are shown to the right of Fig. 5 and in detailin Fig. 6. In this arrangement the gripping member is provided with acentering lug 41, which projects through the perforation It in the diskT and engages in the socket 522 of the opposite gripping member.

The gripping member 40 is pressedinto engagement with the disk by meansof a hy- 7 draulic ram and is automatically withdrawn when the pressureon said ram is released by springs, as will now be described.

\eferring especially to the right of Fig. 5 and Fig. 6, 42 represents acylindrical casing extending across the head 4 of the standard which isprovided with the annular flange 43 secured to the standard head bymeans of the bolts 44. This cylindrical casing extends to the rear asshown at 42 and is slotted as at 45. At the rear end it is provided withan annular flange 46 which is secured to the flange 47 of the enlargedend 48 of the hydraulic cylinder 49.

:Mountcd in the cylindrical casing 42 is a bearing sleeve 50 which isheld in place therein by the set screws 51 and is provided with asuitable packing 52. Projecting through this bearing sleeve 50 is thetubular spindle 53 carrying'the gripping member 40. This tubular spindleis shouldered as at 54 to engage the ring 55 of the thrust ball bearing,which is provided with a ball race 56 generally similar to that alreadydescribed in connection with Fig. 6. Exterior to this ball race is aspherical guiding ring 57 which does not turn in the apparatus, butwhich is pressed towards the antifriction hearing by the face 58 of theen-' larged portion 59 of the hydraulic piston 60. This hydraulic pistonis provided'with suitable packing 61 in the chamber 49 of the hydrauliccylinder 49.

The hydraulic piston is longitudinally perforated as shown, and ischambered, as

at 59, to receive the rings 60 fast on the rear end of the spindle 58,in front of which rings is the antifriction bearing61, to engage theyoke 62, which has arms 63, connected by the springs 64, to the arms 65projecting from the hydraulic cylinder 49. The purpose of thisarrangement is to cause the springs 64, which are normally undertension, to automatically withdraw the grip ping member 40 fromengagement with the disk and with the cooperating gripping member 21.

To facilitate cooling the parts, I provide sleeve is reduced at itsforward end, as at 69, and a packing is provided between it and thetubular spindle 53 to prevent mixing of the oil used in lubrication andthe water used in cooling.

' The reduced portion 69 of the sleeve 66 is clear of the inner bore ofthe spindle 53 so as to not impede in any way the rotation of saidspindle. The rear end of this sleeve 66 is also reduced in diameter, asat 71, and projects into the stufiing-box 72 formed at the rear end ofthe hydraulic cylinder. The packing in this stufiing box is pressed uponby the annular flange 73- of the hollow cap 74, which is secured to theouter end of the hydraulic cylinder by means of the bolts 75. This capis hollow as shown, and is provided with an outlet 76.

Passing through this cap and through the sleeve 66, and through thehollow stem 53, is the tube 77 for supplying cooling water; the waterbeing supplied through the nipple 78 from a hose or other source ofsupply- This pipe is supported at one end in the bearing 7 9 in the cap74, and at its other end in the bearing 80 in the gripping member 40.,The cooling liquid flows through the nipple 78, and through the pipe 7 7and into the hollow chamber in the gripping member 40, whence it returnsthrough the passages 81, exterior to said pipe, back to the hollow cap74 and out through the outlet 76.

- The lubricant is supplied to the thrust bearing shown in Figs. 6 and 6from the grease cups U and U, shown in dotted lines in said figures.

In order to secure the'highest efiiciency in the operation of themachine, it is important that the axis of the disk being rolled shallnot lie in theplane of the axes of the two rolls. Preferably such axisshould be lying in a plane above and parallel to the plane passingthrough the axes of the two rolls, such difference in elevation beingshown by the lines ww and 2 of Figure 2.

The advantages of this arrangement will be more fully brought out afterexplaining the operation of the apparatus, which will' now be described.

The rollers H and H being of the desired profile for the finished disk,are spaced apart to receive the same by releasing the hydraulic pressureon the ram N, which will cause the springs N to withdraw the ram andwith it the roller H far enough to permit the admission of the edge ofthe blank. About the same time the blank is inserted between thegripping members 21 and 40, the perforation in the blank is slipped overthe tongue 41, while the gripping member 40 is in the retracted positionunder the action of the springs 64. The gripping member 40 is thenpressed towards the gripping member 21 by supplying hydraulic pressureto the cylinder 49, and the gripping members are in the assembledposition for holding the disk blank, as shown in Figure 5. The center ofthe disk remains statlonary during the rolling operation, that is itdoes not move towards or away from said rolls, while said disk rotatesabout its axis.

The hydraulic pressure is then admitted to the ram N, pressing theroller H towards the roller H and the disk will be held between therollers under the yielding pressure permitted by the springs L, see Fig.3.

The rolls driven by shaft E will roll the piece to be wrought by causingan elongation of the metal towards the periphery of the disk and aprogressive decrease in thickness of the blank in order to obtain thedesired section as the roll H moves closer and closer towards roll H Theelongation of the metal is more easily efi'ected by placing the axis y-yof the blank to be rolled above axis mm of the rolls as shown in Fig. 2.This also reduces the rolling time. It is especially desirable that thework should be rapidly done so that it may be completed be-' fore thetemperature of the disk falls too low, and at the same time it isobviously desirable to have the work accomplished with as little wasteof ener y as practicable.

It will be noted that with the construction shown there will be obtainedapolishing effect and a rational drawing out of the metal allowing toobtain disks being perfectly fiat.

In order to regulate the time in which the disk is being operated uponin the apparatus,

and at the same time to control the actual work done on the disk, Iprovide the cam shown in Figs. 1, 3 and 4, with the means for drivingthe same shown more especially in Fig. 1. This cam is rotated slowlyunder the action of the worm S driven by the belt S, which worm drivesthe worm wheel R, and with it the shaft R and cam R rigidly held on saidshaft. This cam engages the roller Q, on the shaft Q, and serves as apositive stop to the forward movement of the piston N, see Fig. 3.

. The point-r of maximum throw of the cam is so adjusted that the pistonN will be held backwards at the beginning of the operation of rollingthe disk, and as this cam rotates, the piston N will be allowed bythecam to move the roller H more'and more towards the roller H so thatat the end of one complete revolution of the cam the operation ofrolling a single disk will be completed.

'When the rolling operation of a single disk has been completed, thehydraulic pressure on the piston N is released and said piston is drawnback by the springs N (far enough to permit the removal of the rolleddisk as soon as the gripping members are separated. These grippingmembers are separated by the springs 64 when the hydraulic pressure onthe piston 60 is released.

The rolled disk may then be removed and a i new blank may be inserted asbefore, and

The blanks are inserted in the machine while hot, and in order to keepthe gripping members cool while in use, and also to provide for acertainamount of shrinkage at the center of the disk being rolled, I provide acooling arrangement, such as is shown in Figs. 6 and 6 in which waterisinserted from opposite ends of the apparatus through the pipes 38 and78, and,-fiowing inward through the axes of the gripping members, entersthe hollow heads of said members and returns through passages plpes 31and 81, respectively, and fina'lly escapes through-the waste orifices 35and 76, respectively.

The heavy thrust incident to the pressing together of the grippingmembers by the hydraulic piston 60 is taken up by the thrust blillllbearings shown in Figs. 6 and 6*, and t ese suitable lubricant suppliedto-the chambers 5, which chambers are normally closed by the caps 6 asshown in Fig. 11.

The shells of rollers H and H are made of hard metal. They are taperedso that the intersection of their center lines will fall beyond centerof blank to be rolled and allow, owing to the ossibility of changingposition of front and rear bearings, rolling of different profiles withthe same rolls. These roller shells can easily be removed when worn.

It will be seen that the flexible shaft arrangement with intermediateshaft and coupling, shown in Figs. 1 and 2 will permit the two rollersto be moved together or separated without interfering with the properoperation of the driving mechanism, and that the position of the tworollers will be adjused opposite to each other when desired. Moreover,it will be noted that spring buflers or bearings are provided which willeliminate the sudden shocks incident to the use of h draulic mechanismof the character described, and will serve to prevent the breaking downand unimelv wearing out of the apparatus from such shocks.

The time of rolling may be varied if desired bv changing the shape. orconto r of the cam, makina the cam shorter if desired.

The stand carrving the gripping members mav be adiusted towa d or awayfrom the rolls by means of the adjusting screw 2 and the hand wheel 3.but once set for any class It will be obvious that various modificationsmight be made in the herein described;

exterior to the apparatus, and in the construction, combination andarrangement of parts which Having thus described my invention what Iclaim and desire to secure by Letters Patent of the United States is 1.In a mill for rolling disks, the combination with a pair of shafts setat an angle, and means for simultaneously drivin said shafts. in reversedirections, of tapere rollers mounted on the ends of said shafts, meansfor separating said r'ollers, means for moving one of said rollerstowards the other when desired, a stand mountedad'acent to said rollers,and a revoluble wo r holder carried by said stand and having its axis ina different horizontal plane from the plane including the axis of saidrollers. j

2. In a mill for rolling disks, the combination with a pair of shaftsset at an angle, and means for simultaneouslydrivin said shafts inreverse directions, of rollers 1n the form of truncated cones mounted onthe ends of said shafts, means for separating said rollers, means formoving one of said rollers towards the other when desired, a standmounted adjacent to said rollers, and a .revoshafts in reversedirections, of rollers 1n the form of truncated cones mounted on theends of said shafts, means for separating sa1d rollers means for movingone of sa1d rollers towards the other when desired, means for positivelylimiting saidmovement a stand mounted adjacent to said rollers, and arevoluble work holder carried b said stand.

4. In a mill for rolling isks' the combination with a pair of shaftsset'at an angle, and means for simultaneously driving said shafts inreverse.directions, of rollers in the form of truncated cones mounted onthe ends of said shafts, means for separatin said rollers, means formoving one of sai rollers toward the other when desired, a camarrangement for positively limiting said movement, a stand mountedadjacent to said rollers, and a revoluble work holder carried by saidstand.

5. In a mill for rolling disks, the combination with a pair of shaftsset at an angle,

and means for simultaneously drivin said shafts in reverse directions,of rollers 1n the form of truncated cones mounted on the ends of saidshafts, means for separating said rollers, a hydraulic ram for forcingone of said rollers towards the other when desired, and a revoluble workholder.

6. In a millfor rolling disks, the combination with .a pair of flexibleshafts set at an angle, and means for simultaneously driving said shaftsin reverse directions, of rollers "in the form of truncated conesmounted on the ends of said shafts, cup

- springs for separating said rollers, a hydraulic ram for forcing oneof said rollers towards the other when desired, and a revoluble Workholder.

7. In a mill for rolling disks, the combination with a pair of shaftsset at an angle, and means for simultaneously driving said shafts inreverse directions, of rollers in the form of truncated cones mounted onthe ends of said shafts, means for separating said rollers, means formoving one of said rollers towards the other when desired, a

cam arrangement for positively limiting said movement, and a revolublework holder. 8. In a mill for rolling disks, the combination with a pairof shafts set at an angle, and means for simultaneously driving saidshafts in reverse directions, of rollers in the form of truncated conesmounted on the ends of said shafts, means for moving one of said rollerstowards the other when desired, a stand mounted adjacent to saidrollers, a revoluble work holder, comprising longitudinally movablegripping members, carried by said stand, said work holder and means forconveying coolingfluid to said gripping members.

'9. In a mill for rolling. disks, the combination with a pair of shaftsset at an angle, and means for simultaneously driving said shafts inreverse directions, of rollers in the form of truncated cones mounted onthe ends of said shafts, means for separating said rollers, means formoving one of said rollers towards the other when desired, a .camarrangement for positively limiting jsaid movement, a stand mountedadjacent to said rollers, a revoluble work holder carried by said stand,and means for conveying cooling fluid to said work holder.

10. In a m1ll for rolling disks, the combination with a pair of shaftsset at an angle, and means for simultaneously driving said shafts inreverse directions, of rollers in the form of truncated cones mounted onthe ends of said shafts, means for separating said. rollers, a'hydraulicram forforcing one of said rollers towards the other when desired, astand mounted adjacent to said rollers, a revoluble work holder carriedby said stand,and means for conveying cooling fluid to said work holder.

loo

ed on the ends of said shafts, cup springs I for separating saidrollers, a hydraulic ram for forcing one of said rollers towards the.

other when desired, a stand mounted ad jacent to said rollers, arevoluble work holder carried by said stand andincluding longitudinallymovable gripping members, and means for conveying cooling fluid to saidgripping members.

12. In a mill for rolling disks,'the combination with a pair of shaftsset at an angle,

and means for simultaneously driving said shafts in reverse directions,of rollers in I the form of truncated cones mounted onthe ends of saidshafts, means for separating said rollers, means renamin one of saidrollers towards the other when desired, means for positively limitingsaid movement, a stand mounted adjacent to said rollers, a revolublework holder carried by said stand, and means for conveying cooling fluidto said work holder. v

13. In a mill for rolling disks, the combination with a pair of shaftsset at an angle, and means for simultaneously driving said shafts inreverse directions, of tapered roll- I ers mounted on the ends of saidshafts, means for forcing one of said rollers towards the other, arevoluble work holder having its axis in a different horizontal planefromthe plane including the axes of said rollers,

and means for supplying cooling fluid to said 15. In a mill for rollingdisks, the combination with a pair of shafts set at an angle, and meansfor simultaneously driving said shafts in reverse directions, of rollersin the form of truncated cones mounted on the ends of said shafts, meansfor separating said rollers, means for moving one of said rollerstowards the other when desired, a revoluble work holder, comprisinglongitudinally movable hollow gr1pping members,

said work holder, and means for supplying a Igooling fluid to saidhollow gripping memers.

16. In a mill for rolling disks, the combination with a pair of shaftsset at anangle, and means for simultaneously driving said shafts inreverse directions, of rollers in-the form of truncated cones mounted onthe ends of said shafts, means for separating said rollers, means formoving one of said rollers towards the other when desired, a

revoluble work holder, comprising longitudinally movable hollow grippingmembers, and means for supplying cooling fluid to said hollow grippingmembers.

nation with a pair of shafts set at an angle, and means forsimultaneously driving said shafts in reverse directions, of taperedrollers mounted on the ends of said shafts, a hydraulic ram for forcingoneof said rollers towards the other, a cam arrangement for positivelylimiting said movement, and a revoluble work holder.

18. In a mill for rolling disks, the combination with a air of shaftsset at an angle, and means or simultaneously driving said shafts inreverse directions, of tapered-- rollers mounted on the ends of saidshafts, a hydraulic ram for forcing one of said rollers towards theother, a cam arrangement for positively limiting said movement, and

a revoluble work holder.

ANDRE J ULES MICHELIN.

17 In a mil-l for rolling disks, the combi-

